The zrc Grands Fonds combines comfort and traditional aesthetics with uncompromising technical reliability. A contemporary face of the original Grands Fonds 300, this Vintage declination with tropical dial and leather strap has all the advantages of a watch Structure One-piece case Screwed case back and crown Diameter 41.5 mm Material 316L non-magnetic steel ISO764 standard: 4800 a/m Bezel Ecs system (patent pending #1462496) Unidirectional rotating bezel with 60 notches Ceramic insert Crown Placed at 6 o'clock (Crown Protection System). Reverse threading with double sealing Glass 3-mm convex sapphire with anti-reflective coating Water resistance Resistant to 1000 m, tested to 1500 m Caliber sellita "Elaboré" SW300-1 Adjustment + 5 sec./day Accuracy (± 5 sec./day) = max. 0 to 10 sec./day Loading Automatic loading Power reserve 56 hours Functions Hours - Minutes - Seconds